#include <regex>
class Solution {
private:
    class sum {
    public:
        sum()
        {

            i += count;
            count++;
        }

    };
    static int count;
    static int i;
public:

    int Sum_Solution(int n) {
        sum  arr[n];
        return i;
    }
};

int Solution::count = 1;
int Solution::i = 0;